WO2008141472A1 - Flow channel for a mixer-heat exchanger - Google Patents

Flow channel for a mixer-heat exchanger Download PDF

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Publication number
WO2008141472A1
WO2008141472A1 PCT/CH2008/000226 CH2008000226W WO2008141472A1 WO 2008141472 A1 WO2008141472 A1 WO 2008141472A1 CH 2008000226 W CH2008000226 W CH 2008000226W WO 2008141472 A1 WO2008141472 A1 WO 2008141472A1
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WO
WIPO (PCT)
Prior art keywords
flow channel
planes
web plates
intersecting
longitudinal axis
Prior art date
Application number
PCT/CH2008/000226
Other languages
German (de)
French (fr)
Inventor
Martin SCHÖCHLIN
Original Assignee
Atlas Holding Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Holding Ag filed Critical Atlas Holding Ag
Priority to DE502008002619T priority Critical patent/DE502008002619D1/en
Priority to EP08748356A priority patent/EP2150765B1/en
Priority to AT08748356T priority patent/ATE498810T1/en
Priority to US12/601,119 priority patent/US8628233B2/en
Publication of WO2008141472A1 publication Critical patent/WO2008141472A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B01F25/43161—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod composed of consecutive sections of flat pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/93—Heating or cooling systems arranged inside the receptacle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0052—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0098—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for viscous or semi-liquid materials, e.g. for processing sludge

Definitions

  • the invention relates to a flow channel for a mixer-heat exchanger, which flow channel is tubular with a longitudinal axis and a circular in cross-section inner surface with an inner diameter and at least one mixing insert a length with a plurality of parallel to the longitudinal axis of the flow channel over the length of the mixing insert guided tubes having an inner diameter and arranged with a plurality of crossed, with the longitudinal axis of the flow channel at an angle including web plates of a width, wherein the web plates are arranged in two intersecting, a plurality of parallel planes with an intermediate spacing plane shares, and a third, a plurality of parallel planes having a width of the web plates corresponding spacing having plane group which intersects two intersecting plane shares at right angles, wherein the intersection lines of the planes of two intersecting planes of planes form with the planes of the third layer family longitudinal edges of the web plates arranged alternately between adjacent planes of the third group of planes in the planes of the two intersecting planes of planes, wherein the tubes are guided
  • a flow channel of the aforementioned type is known from EP 1 067 352 B1.
  • the invention has for its object to provide a flow channel of the type mentioned above, which leads to a significant improvement in the heat exchange, especially in highly viscous liquids and the construction o allows a compact heat exchanger.
  • each mixing insert has at least 28 web plates crossed in pairs, the ratio of the web width to the inner diameter of the flow channel is at least 0.25, the ratio of the length of the mixing insert to the inner diameter of the flow channel is at least 0.4 and the angle of the web plates to the longitudinal axis the flow channel 30 ° to 60 ° and the ratio of the distance between adjacent planes of the intersecting, the web plates having planes level to the inner diameter of the flow channel o at most 0.3 and the inner diameter of the tubes is less than 6.
  • the ratio of the distance between adjacent electrodes is preferably NEN of the intersecting, the web plates having planes level to the inner diameter of the tubes less than 4, in particular less than 3.
  • the mentioned Nusselt number is a dimensionless measure from the theory of similarity of heat transfer, which measures the improvement of heat transfer from a surface, if one compares the actual conditions with the conditions in which only heat conduction through a dormant layer would occur. Surprisingly, falls below the ratio of the above-defined land distance to the inner diameter of the tubes below a certain value, a hitherto unexplained further improvement of the heat transfer. This phenomenon can be seen in FIG. 5.
  • the crossed web plates can have a different angle to the longitudinal axis of the flow channel. However, an equal angle is preferred.
  • the planes of the two intersecting layers of planes can have different distances between them. However, an equal spacing is preferred.
  • the planes of the two intersecting planes of planes can have a slight curvature in the longitudinal axis of the flow channel.
  • the planes of the third group of planes may have a different intermediate distance, i.
  • the web plates can be different widths. However, an equal spacing of the planes and, accordingly, a same width of all web plates is preferred.
  • the mixing inserts in the flow channel are arranged one behind the other, wherein the adjacent mixing inserts are rotated by an angle of 90 ° about the longitudinal axis of the flow channel against each other.
  • the freely positionable tubes may be brazed or welded to the web plates or the web plates may have shrunk to the tubes.
  • a second component via at least one tube with at least one hole for a liquid outlet, preferably over several pipes with several Reren holes, a first, flowing in the flow channel component are mixed.
  • mixing inserts can be arranged one behind the other with distances of at most three times the length of a mixing insert, with the mixing inserts being rotated against each other by an angle of 90 ° according to the distances.
  • the flow channel according to the invention is suitable as a static mixer.
  • 1 is a side view of two adjacent mixing inserts for a flow channel.
  • FIG. 2 shows an oblique view of a mixing insert
  • FIG 3 is a view of a mixing insert in a flow channel in the direction of the longitudinal axis of the flow channel.
  • Fig. 5 shows the dependence of the Nusselt number on the ratio of the web distance to the tube inner diameter. Description of exemplary embodiments
  • Two mixing inserts 10, 12 having a length L and pointing in their longitudinal axis m for media flowing in a flow channel, according to FIG. 2, have a tube bundle 14 arranged at 188 parallel to the longitudinal axis m over the entire length Length L extending tubes 16 on.
  • Each mixing insert 10, 12 has a plurality of intersecting web plates 18 A, 18 B.
  • the web plates 18 A, 18 B all have the same width b and lie in mutually parallel with the same distance a arranged planes EA, EB, the two intersecting plane shares A, B form.
  • the planes EA of the plane group A include with the longitudinal axis m in each case an equal angle ⁇ A, ⁇ B of 45 °.
  • Layers EC of a third group of planes C arranged parallel to one another with a spacing b corresponding to the width b of the web plates 18 A, 18 B extend parallel to the longitudinal axis m and intersect the planes EA, EB of the two intersecting planes A, B at right angles.
  • the lines of intersection of the planes EA, EB of the two intersecting planes A, B form the planes EC of the third plane group C longitudinal edges 20 A, 20 B alternately between adjacent planes EC in the planes EA, EB of the two intersecting planes A, B arranged web plates 18 A, 18 B.
  • the adjoining mixing inserts 10, 12 are arranged rotated by an angle of 90 ° about its longitudinal axis m against each other.
  • Fig. 3 the mutually rotated by an angle of 90 ° about its longitudinal axis m mixing inserts 10, 12 in a tubular flow channel 22 having an inner circumferential surface 24 with a circular cross-section, an inner diameter Di and a pipe or Strömungskanall Kunststoffsachse x.
  • the longitudinal axes m of the mixing inserts 10, 12 lie in the longitudinal direction.
  • All web plates 18 A, 18 B extend within each mixing insert 10, 12 via their respective maximum through the end faces of the mixing inserts 10, 12 and through the inner wall of the flow channel, maximum length, the contour of the web plates 18 A, 18 B the circular Cross-section of the flow channel 22 is adapted so that the web plates 18 A, 18 B adjoin the inner circumferential surface 24 of the flow channel 22 with a small clearance.
  • the tubes 16 pass through the web plates 18 A, 18 B via openings arranged in these, which have according to the angle between the web plate 18 A, 18 B and tube 16 an elliptical edge boundary.
  • the tubes 16 are secured in the region of the openings via a soldering or welding point on the web plates 18 A, 18 B.
  • the web plates 18 A, 18 B are connected to each other at their intersections via soldering or welding points.
  • the individual mixing inserts 10, 12 are prefabricated by the crossed arrangement of the corresponding number of web plates 18 A, 18 B.
  • the prefabricated mixing inserts 10, 12 are rotated by 90 ° against each other in their longitudinal axis m strung together.
  • the tubes 16 are pushed parallel to the longitudinal axis m through the openings in the web plates 18 A, 18 B and secured thereto.
  • the insert thus manufactured is subsequently inserted into the flow channel.
  • FIG. 5 graphically shows the results of measurements of the heat transfer at three differently constructed flow channels S1, S2, S3 as Nusselt number (Nu) as a function of the ratio between web distance (a) / inner pipe diameter (di) at a constant reference Peclete number (Pe ref ) shown.
  • Nusselt number Nu
  • Pe ref Peclete number
  • the web distance (a) results from the measured values from the ratio between the web distance (a) / inner pipe diameter (di) in FIG. 5. From FIG. 5, the surprising effect that the heat transfer suddenly rises unexpectedly when falling below a certain ratio is clear seen.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fluid Mechanics (AREA)
  • Dispersion Chemistry (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention relates to a flow channel (22) having a mixing insert and a plurality of tubes (16) guided parallel to the longitudinal axis of the flow channel (22) over the length (L) of the mixing insert (10, 12), each mixing insert (10, 12) comprising at least twenty-eight pairwise crossed multi-wall sheets (18 A, 18 B), the ratio of the width (b) of the multi-wall sheets (18 A, 18 B) to the inside diameter (Di) of the flow channel (22) being no more than 0.25, the ratio of the length (L) of the mixing insert (10, 12) to the inside diameter (Di) of the flow channel (22) being no less than 0.4, and the angle (alpha) of the multi-wall sheets (18 A, 18 B) to the longitudinal axis (x) of the flow channel (22) being 30 to 60 and the ratio of the intermediate spacing (a) of neighboring planes (EA, EB) to the inside diameter of the flow channel (22) being no more than 0.3, and to the inside diameter of the tubes (16) being less than 6.

Description

Strömungskanal für einen Mischer-Wärmetauscher Flow channel for a mixer heat exchanger
Technisches GebietTechnical area
Die Erfindung betrifft einen Strömungskanal für einen Mischer-Wärmetauscher, welcher Strömungskanal rohrförmig mit einer Längsachse und mit einer im Querschnitt kreisrunden Innenmantelfläche mit einem inneren Durchmesser ausgebildet ist und mindestens einen Mischeinsatz einer Länge mit einer Vielzahl von parallel zur Längsachse des Strömungskanals über die Länge des Mischeinsatzes geführten Rohren mit einem inneren Durchmesser und mit einer Vielzahl von gekreuzt angeordneten, mit der Längsachse des Strömungskanals einen Winkel einschliessenden Stegplatten einer Breite aufweist, wobei die Stegplatten in zwei sich kreuzenden, eine Vielzahl von parallelen Ebenen mit einem Zwischenabstand aufweisenden Ebenenscharen angeordnet sind, und eine dritte, eine Vielzahl von parallelen Ebenen mit einen der Breite der Stegplatten entsprechenden Zwischenabstand aufweisende Ebenenschar die zwei sich kreuzenden Ebenenscharen rechtwinklig schneidet, wobei die Schnittlinien der Ebenen der zwei sich kreuzenden Ebenenscharen mit den Ebenen der dritten Ebenenschar Längskanten der zwischen benachbarten Ebenen der dritten Ebenenschar alternierend in den Ebenen der zwei sich kreuzenden Ebenenscharen angeordneten Stegplatten bilden, wobei die Rohre durch Öffnun- gen in den Stegplatten hindurchgeführt und an den Stegplatten befestigt sind. Stand der TechnikThe invention relates to a flow channel for a mixer-heat exchanger, which flow channel is tubular with a longitudinal axis and a circular in cross-section inner surface with an inner diameter and at least one mixing insert a length with a plurality of parallel to the longitudinal axis of the flow channel over the length of the mixing insert guided tubes having an inner diameter and arranged with a plurality of crossed, with the longitudinal axis of the flow channel at an angle including web plates of a width, wherein the web plates are arranged in two intersecting, a plurality of parallel planes with an intermediate spacing plane shares, and a third, a plurality of parallel planes having a width of the web plates corresponding spacing having plane group which intersects two intersecting plane shares at right angles, wherein the intersection lines of the planes of two intersecting planes of planes form with the planes of the third layer family longitudinal edges of the web plates arranged alternately between adjacent planes of the third group of planes in the planes of the two intersecting planes of planes, wherein the tubes are guided through openings in the web plates and fastened to the web plates. State of the art
Aus DE 28 08 854 C3 ist ein nach üblichem Sprachgebrauch als "statischer Mischer" bezeichneter Strömungskanal für einen Wärmeaustausch mit Einbau- 5 ten aus parallelen Gruppen von einander durchkreuzenden, an ihren Kreuzungsstellen miteinander verbundenen Stegen bekannt. Diese Vorrichtung mischt hauptsächlich den Stoffstrom. Das Umlenken der Stoffströme bewirkt an der Rohrwand eine Verbesserung des Wärmeüberganges. Die Doppelmantelkonstruktion wird jedoch sehr lang und der Druckverlust entsprechend hoch.0From DE 28 08 854 C3 is a customary usage as a "static mixer" designated flow channel for heat exchange with Einbau- 5 th from parallel groups of intersecting, at their intersections interconnected webs known. This device mainly mixes the material flow. The deflection of the streams causes the pipe wall to improve the heat transfer. However, the double-jacket construction becomes very long and the pressure loss correspondingly high
Ein Strömungskanal der eingangs genannten Art ist aus EP 1 067 352 B1 bekannt.A flow channel of the aforementioned type is known from EP 1 067 352 B1.
5 Darstellung der Erfindung5 Presentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, einen Strömungskanal der eingangs genannten Art zu schaffen, der insbesondere bei hochviskosen Flüssigkeiten zu einer wesentlichen Verbesserung des Wärmeaustausches führt und den Bau o eines kompakten Wärmetauschers ermöglicht.The invention has for its object to provide a flow channel of the type mentioned above, which leads to a significant improvement in the heat exchange, especially in highly viscous liquids and the construction o allows a compact heat exchanger.
Zur erfindungsgemässen Lösung der Aufgabe führt, dass jeder Mischeinsatz mindestens achtundzwanzig paarweise gekreuzte Stegplatten aufweist, das Verhältnis der Stegbreite zum Innendurchmesser des Strömungskanals höchs-5 tens 0.25, das Verhältnis der Länge des Mischeinsatzes zum Innendurchmesser des Strömungskanals mindestens 0.4 und der Winkel der Stegplatten zur Längsachse des Strömungskanals 30° bis 60° und das Verhältnis des Abstandes zwischen benachbarten Ebenen der sich kreuzenden, die Stegplatten aufweisenden Ebenenscharen zum Innendurchmesser des Strömungskanals o höchstens 0.3 und zum Innendurchmesser der Rohre weniger als 6 beträgt.To solve this problem according to the invention, each mixing insert has at least 28 web plates crossed in pairs, the ratio of the web width to the inner diameter of the flow channel is at least 0.25, the ratio of the length of the mixing insert to the inner diameter of the flow channel is at least 0.4 and the angle of the web plates to the longitudinal axis the flow channel 30 ° to 60 ° and the ratio of the distance between adjacent planes of the intersecting, the web plates having planes level to the inner diameter of the flow channel o at most 0.3 and the inner diameter of the tubes is less than 6.
Bevorzugt beträgt das Verhältnis des Abstandes zwischen benachbarten Ebe- nen der sich kreuzenden, die Stegplatten aufweisenden Ebenenscharen zum Innendurchmesser der Rohre weniger als 4, insbesondere weniger als 3.The ratio of the distance between adjacent electrodes is preferably NEN of the intersecting, the web plates having planes level to the inner diameter of the tubes less than 4, in particular less than 3.
Bei der aus EP 1 067 352 B1 bekannten und im Markt eingeführten Vorrichtung weisen die Stegplatten aus fertigungstechnischen Gründen einen Winkel von 45° auf, und das Verhältnis des definierten senkrechten Stegabstandes zwischen zwei benachbarten Stegplatten zum Rohrdurchmesser ergibt sich mit 0.3 bis 0.35. Bei den verfahrenstechnischen Untersuchungen haben sich diese Geometrien ausserordentlich bewährt und werden zunehmend in High-Tech- Prozessen eingesetzt.In the known from EP 1 067 352 B1 and introduced on the market device, the web plates for manufacturing reasons, an angle of 45 °, and the ratio of the defined vertical web distance between two adjacent web plates to the pipe diameter is 0.3 to 0.35. In process engineering investigations, these geometries have proven to be extremely successful and are increasingly used in high-tech processes.
Da bei Wärmetauschern ein Scale-Up mit einem geometrisch ähnlichen Apparat immer zu einem schlechteren Oberflächen/Volumen-Verhältnis führt, muss mit zusätzlicher Oberfläche, bei der vorliegenden Erfindung mit zusätzlichen Rohren, das Oberflächen/Volumen-Verhältnis verbessert werden.Since a scale-up with a geometrically similar apparatus always leads to a poorer surface / volume ratio in heat exchangers, with additional surface area, in the present invention with additional tubes, the surface / volume ratio must be improved.
Aus Fig. 4 ist jedoch deutlich zu erkennen, dass mit zunehmender Anzahl Rohre die Nusselt-Zahl abnimmt, so dass mit zusätzlichen Rohren kein und nur ein geringer zusätzlicher Wärmübergang erzielt wird.From Fig. 4, however, it can be clearly seen that with increasing number of tubes, the Nusselt number decreases, so that with additional pipes no and only a small additional heat transfer is achieved.
Aus diesem Grund werden erfindungsgemäss zur Verbesserung der Wärmeübertragung zusätzliche Stegplatten eingesetzt. Mit der Erhöhung der Anzahl Stegplatten verringert sich auch das Verhältnis des definierten senkrechten Stegabstandes zwischen zwei benachbarten Stegplatten zum Innendurchmes- ser des Strömungskanals. Diese zusätzliche Massnahme führt zu einer bis zu 60 % verbesserten Wärmeübertragung.For this reason, according to the invention, additional web plates are used to improve the heat transfer. As the number of web plates increases, so does the ratio of the defined vertical web distance between two adjacent web plates to the inside diameter of the flow channel. This additional measure leads to up to 60% improved heat transfer.
Die erwähnte Nusselt-Zahl (Formelzeichen: Nu, nach Wilhelm Nusselt) ist eine dimensionslose Kennzahl aus der Ähnlichkeitstheorie der Wärmeübertragung, die die Verbesserung der Wärmeübertragung von einer Oberfläche misst, wenn man die tatsächlichen Verhältnisse mit den Verhältnissen vergleicht, bei denen nur Wärmeleitung durch eine ruhende Schicht auftreten würde. Überraschenderweise tritt beim Unterschreiten des Verhältnisses des vorstehend definierten Stegabstandes zum Innendurchmesser der Rohre unter einen bestimmten Wert eine bislang nicht erklärbare weitere Verbesserung der Wär- meübertragung ein. Dieses Phänomen ist aus der Fig. 5 ersichtlich.The mentioned Nusselt number (symbol: Nu, after Wilhelm Nusselt) is a dimensionless measure from the theory of similarity of heat transfer, which measures the improvement of heat transfer from a surface, if one compares the actual conditions with the conditions in which only heat conduction through a dormant layer would occur. Surprisingly, falls below the ratio of the above-defined land distance to the inner diameter of the tubes below a certain value, a hitherto unexplained further improvement of the heat transfer. This phenomenon can be seen in FIG. 5.
Die gekreuzt angeordneten Stegplatten können zur Längsachse des Strömungskanals einen unterschiedlichen Winkel aufweisen. Bevorzugt ist jedoch ein gleicher Winkel.The crossed web plates can have a different angle to the longitudinal axis of the flow channel. However, an equal angle is preferred.
Die Ebenen der zwei sich kreuzenden Ebenenscharen können unterschiedliche Zwischenabstände aufweisen. Bevorzugt ist jedoch ein gleicher Zwischenabstand.The planes of the two intersecting layers of planes can have different distances between them. However, an equal spacing is preferred.
Die Ebenen der zwei sich kreuzenden Ebenenscharen können in der Längsachse des Strömungskanals eine leichte Krümmung aufweisen.The planes of the two intersecting planes of planes can have a slight curvature in the longitudinal axis of the flow channel.
Die Ebenen der dritten Ebenenschar können einen unterschiedlichen Zwi- schenabstandaufweisen, d.h. die Stegplatten können unterschiedlich breit sein. Bevorzugt ist jedoch ein gleicher Zwischenabstand der Ebenen und dementsprechend eine gleiche Breite aller Stegplatten.The planes of the third group of planes may have a different intermediate distance, i. The web plates can be different widths. However, an equal spacing of the planes and, accordingly, a same width of all web plates is preferred.
Bevorzugt sind die Mischeinsätze im Strömungskanal hintereinander angeordnet, wobei die aneinander grenzenden Mischeinsätze um einem Winkel von 90° um die Längsachse des Strömungskanals gegeneinander verdreht sind.Preferably, the mixing inserts in the flow channel are arranged one behind the other, wherein the adjacent mixing inserts are rotated by an angle of 90 ° about the longitudinal axis of the flow channel against each other.
Die frei positionierbaren Rohre können an die Stegplatten gelötet oder ge- schweisst sein, oder die Stegplatten können an die Rohre geschrumpft sein.The freely positionable tubes may be brazed or welded to the web plates or the web plates may have shrunk to the tubes.
Bei der Verwendung des erfindungsgemässen Strömungskanals als Mischer kann eine zweite Komponente über mindestens ein Rohr mit mindestens einem Loch für einen Flüssigkeitsaustritt, vorzugsweise über mehrere Rohre mit meh- reren Löcher, einer ersten, im Strömungskanal fliessenden Komponente beigemischt werden.When using the inventive flow channel as a mixer, a second component via at least one tube with at least one hole for a liquid outlet, preferably over several pipes with several Reren holes, a first, flowing in the flow channel component are mixed.
Im Strömungskanal können mehrere Mischeinsätze hintereinander mit Abstän- den der maximal dreifachen Länge eines Mischeinsatzes angeordnet sein, wobei die Mischeinsätze nach den Abständen um einem Winkel von 90° gegeneinander verdreht sind.In the flow channel, several mixing inserts can be arranged one behind the other with distances of at most three times the length of a mixing insert, with the mixing inserts being rotated against each other by an angle of 90 ° according to the distances.
Der erfind ungsgemässe Strömungskanal ist als statischer Mischer geeignet.The flow channel according to the invention is suitable as a static mixer.
Kurze Beschreibung der ZeichnungShort description of the drawing
Weitere Vorteile, Merkmale und Einzelheiten ergeben sich aus der nachfolgen- den Beschreibung eines Ausführungsbeispiels sowie anhand der Zeichnung; diese zeigt inFurther advantages, features and details will become apparent from the following description of an embodiment and with reference to the drawing; this shows in
Fig. 1 eine Seitenansicht von zwei aneinander grenzenden Mischeinsätzen für einen Strömungskanal;1 is a side view of two adjacent mixing inserts for a flow channel.
Fig. 2 eine Schrägsicht auf einen Mischeinsatz;FIG. 2 shows an oblique view of a mixing insert; FIG.
Fig. 3 eine Sicht auf einen Mischeinsatz in einem Strömungskanal in Blickrichtung der Längsachse des Strömungskanals;3 is a view of a mixing insert in a flow channel in the direction of the longitudinal axis of the flow channel.
Fig. 4 die Abhängigkeit der Nusselt-Zahl von der Anzahl Rohre in einem Strömungskanal;4 shows the dependence of the Nusselt number on the number of tubes in a flow channel;
Fig. 5 die Abhängigkeit der Nusselt-Zahl vom Verhältnis des Stegabstandes zum Rohrinnendurchmesser. Beschreibung von AusführungsbeispielenFig. 5 shows the dependence of the Nusselt number on the ratio of the web distance to the tube inner diameter. Description of exemplary embodiments
Zwei in Fig. 1 gezeigte, in ihrer Längsachse m aneinander grenzende, eine Länge L aufweisende Mischeinsätze 10, 12 für in einem Strömungskanal strö- mende Medien weisen gemäss Fig. 2 ein Rohrbϋndel 14 mit 188 parallel zur Längsachse m angeordneten, sich über die gesamte Länge L erstreckenden Rohren 16 auf. Jeder Mischeinsatz 10, 12 weist eine Vielzahl von sich kreuzenden Stegplatten 18 A, 18 B auf. Die Stegplatten 18 A, 18 B weisen alle eine gleiche Breite b auf und liegen in parallel zueinander mit gleichem Zwischenab- stand a angeordneten Ebenen EA, EB, die zwei sich kreuzende Ebenenscharen A, B bilden. Die Ebenen EA der Ebenenschar A schliessen mit der Längsachse m jeweils einen gleich grossen Winkel αA, αB von 45° ein.Two mixing inserts 10, 12 having a length L and pointing in their longitudinal axis m for media flowing in a flow channel, according to FIG. 2, have a tube bundle 14 arranged at 188 parallel to the longitudinal axis m over the entire length Length L extending tubes 16 on. Each mixing insert 10, 12 has a plurality of intersecting web plates 18 A, 18 B. The web plates 18 A, 18 B all have the same width b and lie in mutually parallel with the same distance a arranged planes EA, EB, the two intersecting plane shares A, B form. The planes EA of the plane group A include with the longitudinal axis m in each case an equal angle αA, αB of 45 °.
Parallel zueinander mit einem der Breite b der Stegplatten 18 A, 18 B entspre- chenden Zwischenabstand b angeordnete Ebenen EC einer dritten Ebenenschar C verlaufen parallel zur Längsachse m und schneiden die Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B rechtwinklig. Hierbei bilden die Schnittlinien der Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B mit den Ebenen EC der dritten Ebenenschar C Längskanten 20 A, 20 B der zwischen benachbarten Ebenen EC alternierend in den Ebenen EA, EB der zwei sich kreuzenden Ebenenscharen A, B angeordneten Stegplatten 18 A, 18 B.Layers EC of a third group of planes C arranged parallel to one another with a spacing b corresponding to the width b of the web plates 18 A, 18 B extend parallel to the longitudinal axis m and intersect the planes EA, EB of the two intersecting planes A, B at right angles. Here, the lines of intersection of the planes EA, EB of the two intersecting planes A, B form the planes EC of the third plane group C longitudinal edges 20 A, 20 B alternately between adjacent planes EC in the planes EA, EB of the two intersecting planes A, B arranged web plates 18 A, 18 B.
Wie in Fig. 1 gezeigt, sind die aneinander grenzenden Mischeinsätze 10, 12 um einen Winkel von 90° um ihre Längsachse m gegeneinander verdreht angeordnet.As shown in Fig. 1, the adjoining mixing inserts 10, 12 are arranged rotated by an angle of 90 ° about its longitudinal axis m against each other.
In Fig. 3 sind die um einen Winkel von 90° um ihre Längsachse m gegeneinander verdrehten Mischeinsätze 10, 12 in einem rohrförmigen Strömungskanal 22 mit einer Innenmantelfläche 24 mit kreisförmigem Querschnitt, einem Innendurchmesser Di und einer Rohr- oder Strömungskanallängsachse x angeordnet. Hierbei Liegen die Längsachsen m der Mischeinsätze 10, 12 in der Längs- achse x des Strömungskanals 22.In Fig. 3, the mutually rotated by an angle of 90 ° about its longitudinal axis m mixing inserts 10, 12 in a tubular flow channel 22 having an inner circumferential surface 24 with a circular cross-section, an inner diameter Di and a pipe or Strömungskanallängsachse x. In this case, the longitudinal axes m of the mixing inserts 10, 12 lie in the longitudinal direction. axis x of the flow channel 22.
Sämtliche Stegplatten 18 A, 18 B erstrecken sich innerhalb jedes Mischeinsatzes 10, 12 über jeweils ihre durch die Stirnseiten der Mischeinsätze 10, 12 und durch die Innenwand des Strömungskanals begrenzte, maximal mögliche Länge, wobei die Kontur der Stegplatten 18 A, 18 B dem kreisförmigen Querschnitt des Strömungskanals 22 so angepasst ist, dass die Stegplatten 18 A, 18 B mit kleinem Spiel an die Innenmantelfläche 24 des Strömungskanals 22 angrenzen.All web plates 18 A, 18 B extend within each mixing insert 10, 12 via their respective maximum through the end faces of the mixing inserts 10, 12 and through the inner wall of the flow channel, maximum length, the contour of the web plates 18 A, 18 B the circular Cross-section of the flow channel 22 is adapted so that the web plates 18 A, 18 B adjoin the inner circumferential surface 24 of the flow channel 22 with a small clearance.
Die Rohre 16 durchsetzen die Stegplatten 18 A, 18 B über in diesen angeordnete Öffnungen, die entsprechend dem Winkel zwischen Stegplatte 18 A, 18 B und Rohr 16 eine elliptische Randbegrenzung aufweisen. Die Rohre 16 sind im Bereich der Öffnungen über eine Löt- oder Schweissstelle an den Stegplatten 18 A, 18 B befestigt. Ebenso sind die Stegplatten 18 A, 18 B an ihren Kreuzungsstellen über Löt- oder Schweissstellen miteinander verbunden.The tubes 16 pass through the web plates 18 A, 18 B via openings arranged in these, which have according to the angle between the web plate 18 A, 18 B and tube 16 an elliptical edge boundary. The tubes 16 are secured in the region of the openings via a soldering or welding point on the web plates 18 A, 18 B. Likewise, the web plates 18 A, 18 B are connected to each other at their intersections via soldering or welding points.
Beim Zusammenbau eines Mischer-Wärmetauschers werden die einzelnen Mischeinsätze 10, 12 durch die gekreuzte Anordnung der entsprechenden An- zahl von Stegplatten 18 A, 18 B vorgefertigt. Die vorgefertigten Mischeinsätze 10, 12 werden um 90° gegeneinander verdreht in ihrer Längsachse m aneinandergereiht. Anschliessend werden die Rohre 16 parallel zur Längsachse m durch die Öffnungen in den Stegplatten 18 A, 18 B hindurch geschoben und an diesen befestigt. Das so gefertigte Einsatzteil wird nachfolgend in den Strö- mungskanal eingeschoben.When assembling a mixer-heat exchanger, the individual mixing inserts 10, 12 are prefabricated by the crossed arrangement of the corresponding number of web plates 18 A, 18 B. The prefabricated mixing inserts 10, 12 are rotated by 90 ° against each other in their longitudinal axis m strung together. Subsequently, the tubes 16 are pushed parallel to the longitudinal axis m through the openings in the web plates 18 A, 18 B and secured thereto. The insert thus manufactured is subsequently inserted into the flow channel.
In Fig. 5 sind die Ergebnisse von Messungen der Wärmeübertragung an drei unterschiedlich aufgebauten Strömungskanälen S1 , S2, S3 als Nusseltzahl (Nu) in Abhängigkeit vom Verhältnis Stegabstand (a) / Rohrinnendurchmesser (di) bei einer konstanten Referenz-Pecletzahl (Peref) grafisch dargestellt. Der Aufbau der Strömungskanäle S1 , S2, S3 ist aus der nachstehenden Tabelle ersichtlich. Tabelle: Aufbau der untersuchten StrömungskanäleFIG. 5 graphically shows the results of measurements of the heat transfer at three differently constructed flow channels S1, S2, S3 as Nusselt number (Nu) as a function of the ratio between web distance (a) / inner pipe diameter (di) at a constant reference Peclete number (Pe ref ) shown. The structure of the flow channels S1, S2, S3 can be seen from the table below. Table: Structure of the investigated flow channels
Figure imgf000010_0001
Figure imgf000010_0001
Der Stegabstand (a) ergibt sich aus dem Messwerten aus dem Verhältnis Stegabstand (a) / Rohrinnendurchmesser (di) in Fig. 5. Aus der Fig. 5 ist der überraschende Effekt, dass der Wärmeübergang beim Unterschreiten eines bestimmten Verhältnisses plötzlich unerwartet ansteigt, klar ersichtlich. The web distance (a) results from the measured values from the ratio between the web distance (a) / inner pipe diameter (di) in FIG. 5. From FIG. 5, the surprising effect that the heat transfer suddenly rises unexpectedly when falling below a certain ratio is clear seen.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
10 erster Mischeinsatz10 first mixing insert
12 zweiter Mischeinsatz12 second mixing insert
14 Rohrbündel14 tube bundles
16 Rohre16 pipes
18 A, B Steg platten18 A, B bridge plates
20 Längskanten20 longitudinal edges
22 Strömungskanal22 flow channel
24 Innenmantelfläche24 inner lateral surface
EA erste EbenenEA first levels
EB zweite EbenenEB second levels
EC dritte EbenenEC third levels
A erste EbenenscharA first group of planes
B zweite EbenenscharB second layer group
C dritte EbenenscharC third layer group
L Länge von 10, 12 a Zwischenabstand von EA, EB b Zwischenabstand von EC (Breite der Stegplatten 15 A, B) m Längsachse von 10, 12 x Längsachse von 22 L length of 10, 12 a Interspacing of EA, EB b Interspacing of EC (width of web plates 15 A, B) m Longitudinal axis of 10, 12 x Longitudinal axis of 22

Claims

Patentansprüche claims
1. Strömungskanal für einen Mischer-Wärmetauscher, welcher Strömungskanal (22) rohrförmig mit einer Längsachse (x) und mit einer im Querschnitt kreisrunden Innenmantelfläche mit einem inneren Durchmesser (Di) ausgebildet ist und mindestens einen Mischeinsatz (10, 12) einer Länge (L) mit einer Vielzahl von parallel zur Längsachse (x) des Strömungskanals (22) über die Länge (L) des Mischeinsatzes (10, 12) geführten Rohren (16) mit einem inneren Durchmesser (di) und mit einer Vielzahl von gekreuzt angeordneten, mit der Längsachse (x) des Strömungskanals (22) einen Winkel (α) ein- schliessenden Stegplatten (18 A, 18 B) einer Breite (b) aufweist, wobei die Stegplatten (18 A, 18 B) in zwei sich kreuzenden, eine Vielzahl von parallelen Ebenen (EA, EB) mit einem Zwischenabstand (a) aufweisenden Ebenenscharen (A, B) angeordnet sind, und eine dritte, eine Vielzahl von parallelen Ebenen (EC) mit einen der Breite (b) der Stegplatten (18 A, 18 B) entsprechenden Zwischenabstand (b) aufweisende Ebenenschar (C) die zwei sich kreuzenden Ebenenscharen (A, B) rechtwinklig schneidet, wobei die Schnittlinien der Ebenen (EA1 EB) der zwei sich kreuzenden Ebenenscharen (A, B) mit den Ebenen (EC) der dritten Ebenenschar (C) Längskanten (20) der zwischen benachbarten Ebenen (EC) der dritten Ebenenschar (C) alternierend in den Ebenen (EA, EB) der zwei sich kreuzenden Ebenenscharen (A, B) angeordneten Stegplatten (18 A, 18 B) bilden, wobei die Rohre (16) durch Öffnungen in den Stegplatten (18 A, 18 B) hindurchgeführt und an den Stegplatten (18 A, 18 B) befestigt sind,1. Flow channel for a mixer-heat exchanger, which flow channel (22) is tubular with a longitudinal axis (x) and with a circular in cross-section inner surface area with an inner diameter (Di) and at least one mixing insert (10, 12) of a length (L ) with a plurality of parallel to the longitudinal axis (x) of the flow channel (22) over the length (L) of the mixing insert (10, 12) guided tubes (16) arranged with an inner diameter (di) and with a plurality of crossed, with the longitudinal axis (x) of the flow channel (22) has an angle (α) enclosing web plates (18 A, 18 B) of a width (b), wherein the web plates (18 A, 18 B) in two intersecting, a plurality and a third, a plurality of parallel planes (EC) having one of the widths (b) of the web plates (18A, 18B) of parallel planes (EA, EB) having a pitch (a) B) corresponding intermediate distance (b) a ufweisende Planarschar (C) the two intersecting plateaus (A, B) intersects at right angles, wherein the intersecting lines of the planes (EA 1 EB) of the two intersecting plateaus (A, B) with the planes (EC) of the third set of planes (C) Longitudinal edges (20) of the between adjacent planes (EC) of the third plane group (C) alternately in the planes (EA, EB) of the two intersecting plane shares (A, B) arranged web plates (18 A, 18 B) form, wherein the tubes (16) passed through openings in the web plates (18 A, 18 B) and fixed to the web plates (18 A, 18 B),
dadurch gekennzeichnet, dasscharacterized in that
jeder Mischeinsatz (10, 12) mindestens achtundzwanzig paarweise gekreuzte Stegplatten (18 A, 18 B) aufweist, das Verhältnis der Breite (b) der Stegplatten (18 A, 18 B) zum Innendurchmesser (Di) des Strömungskanals (22) höchstens 0.25, das Verhältnis der Länge (L) des Mischeinsatzes (10, 12) zum Innendurchmesser (Di) des Strömungskanals (22) mindestens 0.4 und der Winkel (α) der Stegplatten (18 A, 18 B) zur Längsachse (x) des Strömungskanals (22) 30° bis 60° und das Verhältnis des Zwischenabstan- des (a) benachbarter Ebenen (EA, EB) der sich kreuzenden, die Stegplatten (18 A, 18 B) aufweisenden Ebenenscharen (EA, EB) zum Innendurchmesser (Di) des Strömungskanals (22) höchstens 0.3 und zum Innendurchmesser (di) der Rohre (16) weniger als 6 beträgt.each mixing insert (10, 12) has at least twenty-eight crossed bridge plates (18 A, 18 B), the ratio of the width (b) of the web plates (18 A, 18 B) to the inner diameter (Di) of the flow channel (22) at most 0.25, the ratio of the length (L) of the mixing insert (10, 12) to the inner diameter (Di) of the flow channel (22) at least 0.4 and the angle (α) of the web plates (18 A, 18 B) to the longitudinal axis (x) of the flow channel (22) 30 ° to 60 ° and the ratio of the interstice (a) of adjacent planes (EA, EB) of the intersecting , the web plates (18 A, 18 B) having plane shares (EA, EB) to the inner diameter (Di) of the flow channel (22) at most 0.3 and the inner diameter (di) of the tubes (16) is less than 6.
2. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass das Verhältnis des Zwischenabstandes (a) benachbarter Ebenen (EA, EB) der sich kreuzenden, die Stegplatten (18 A, 18 B) aufweisenden Ebenenscharen (EA, EB) zum Innendurchmesser (di) der Rohre (16) weniger als 4, vorzugsweise weniger als 3, beträgt.Second flow channel according to claim 1, characterized in that the ratio of the spacing (a) of adjacent planes (EA, EB) of the intersecting, the web plates (18 A, 18 B) having level coulters (EA, EB) to the inner diameter (di) the tubes (16) is less than 4, preferably less than 3.
3. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die gekreuzt angeordneten Stegplatten (18 A, 18 B) zur Längsachse (x) des Strömungskanals (22) einen gleichen Winkel (α) aufweisen.3. flow channel according to claim 1, characterized in that the cross-arranged web plates (18 A, 18 B) to the longitudinal axis (x) of the flow channel (22) have an equal angle (α).
4. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die Ebenen (EA, EB) der zwei sich kreuzenden Ebenenscharen (A, B) einen gleichen Zwischenabstand (a) aufweisen.4. flow channel according to claim 1, characterized in that the planes (EA, EB) of the two intersecting plane shares (A, B) have an equal intermediate distance (a).
5. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die Ebenen (EA, EB) der zwei sich kreuzenden Ebenenscharen (A, B) in der Längsachse (x) des Strömungskanals (20) eine leichte Krümmung aufweisen.5. flow channel according to claim 1, characterized in that the planes (EA, EB) of the two intersecting plane shares (A, B) in the longitudinal axis (x) of the flow channel (20) have a slight curvature.
6. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die Ebenen (EC) der dritten Ebenenschar (C) einen der Breite (b) der Stegplatten (18 A, 18 B) entsprechenden gleichen Zwischenabstand (b) aufweisen.6. Flow channel according to claim 1, characterized in that the planes (EC) of the third plane group (C) have a width (b) of the web plates (18 A, 18 B) corresponding to the same intermediate distance (b).
7. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die Mischeinsätze (10, 12) im Strömungskanal (22) hintereinander angeordnet sind, wobei die aneinander grenzenden Mischeinsätze (10, 12) um einem Winkel von 90° um die Längsachse (x) des Strömungskanals (22) gegeneinander verdreht sind.7. flow channel according to claim 1, characterized in that the mixing inserts (10, 12) in the flow channel (22) are arranged one behind the other, wherein the adjacent mixing inserts (10, 12) to a Angle of 90 ° about the longitudinal axis (x) of the flow channel (22) are rotated against each other.
8. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass die Rohre (14) frei positionierbar sind.8. flow channel according to claim 1, characterized in that the tubes (14) are freely positionable.
9. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass mindestens ein Rohr (14) mindestens ein Loch für einen Flüssigkeitsaustritt aufweist.9. flow channel according to claim 1, characterized in that at least one tube (14) has at least one hole for a liquid outlet.
10. Strömungskanal nach Anspruch 1 , dadurch gekennzeichnet, dass im Strömungskanal (22) mehrere Mischeinsätze (10, 12) hintereinander mit Abständen der maximal dreifachen Länge (L) eines Mischeinsatzes (10, 12) angeordnet sind, wobei die Mischeinsätze (10, 12) nach dem den Abständen um einem Winkel von 90° gegeneinander verdreht sind.10. flow channel according to claim 1, characterized in that in the flow channel (22) a plurality of mixing inserts (10, 12) one behind the other with intervals of a maximum of three times the length (L) of a mixing insert (10, 12) are arranged, wherein the mixing inserts (10, 12 ) After the distances are rotated by an angle of 90 ° to each other.
11. Verwendung eines Strömungskanals (22) nach einem der vorangehenden Ansprüche als statischer Mischer. 11. Use of a flow channel (22) according to one of the preceding claims as a static mixer.
PCT/CH2008/000226 2007-05-24 2008-05-20 Flow channel for a mixer-heat exchanger WO2008141472A1 (en)

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